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Home >> Cadillac >> 2016 >> SRX Base >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Power Door Lock System And Release Systems >> Diagnostic Information and Procedures >> Liftgate Release Malfunction (Without TB5) >> Circuit/System Testing
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Circuit/System Testing

Liftgate Release Switch Inoperative

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S46B Liftgate Unlatch Switch. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 1 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Verify the scan tool Trunk Lid/Liftgate Window Exterior Unlatch Switch parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the signal circuit terminal 2 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
    • If Inactive 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the ground circuit terminal 1.
  6. Verify the scan tool Trunk Lid/Liftgate Window Exterior Unlatch Switch parameter is Active.
    • If not Active 
    1. Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • If Active 
  7. Test or replace the S46B Liftgate Unlatch Switch.

Liftgate Latch Inoperative

  1. Ignition OFF, and all vehicle systems OFF. Disconnect the harness connector at the A23C Liftgate Latch Assembly. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 3 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  3. Connect a test lamp between the control circuit terminal 1 and ground, ignition ON.
  4. Verify the test lamp does not turn ON and OFF when commanding the Liftgate Unlatch with a scan tool.
    • If the test lamp turns ON and OFF 

      Test or replace the A23C Liftgate Latch Assembly.

    • If the test lamp does not turn ON or OFF 
  5. Ignition OFF, connect the harness connector at the A23C Liftgate Latch Assembly. Disconnect the X3 harness connector at the X53A Fuse Block-Rear Body, ignition ON.
  6. Verify the A23C Liftgate Latch Assembly is not activated.
    • If the A23C Liftgate Latch Assembly is activated 
    1. Ignition OFF, disconnect the harness connector at the A23C Liftgate Latch Assembly, ignition ON.
    2. Test for less than 1 V between the control circuit terminal 1 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, test or replace the A23C Liftgate Latch Assembly.
    • If the A23C Liftgate Latch Assembly is not activated 
  7. Connect a 15 A fused jumper wire between the control circuit terminal 8 and B+.
  8. Verify the A23C Liftgate Latch Assembly activates.
    • If the A23C Liftgate Latch Assembly does not activate 
    1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the A23C Liftgate Latch Assembly, ignition ON.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than Infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the A23C Liftgate Latch Assembly.
    • If the A23C Liftgate Latch Assembly activates 
  9. Ignition OFF, connect the X3 harness connector at the X53A Fuse Block-Rear Body. Disconnect the X4 harness connector at the K9 Body Control Module, ignition ON.
  10. Verify the A23C Liftgate Latch Assembly is not activated.
    • If the A23C Liftgate Latch Assembly is activated 
    1. Ignition OFF, disconnect the X3 harness connector at the X53A Fuse Block-Rear Body.
    2. Test for less than 1 V between the K9 Body Control Module control circuit terminal 8 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the X53A Fuse Block-Rear Body.
    • If the A23C Liftgate Latch Assembly is not activated 
  11. Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module.
  12. Connect a jumper wire between the control circuit terminal 20 X5 and ground.
  13. Connect a 3A fused jumper wire between the control circuit terminal 8 X4 and B+.
  14. Verify the A23C Liftgate Latch Assembly activates.
    • If the A23C Liftgate Latch Assembly does not activate 
    1. Remove the jumper wires, disconnect the X2 harness connector at the X53A Fuse Block-Rear Body.
    2. Test for infinite resistance between the K9 Body Control Module control circuit terminal 8 X4 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuits listed below end to end.
      • Control circuit terminal 8 X4
      • Control circuit terminal 20 X5
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the X53A Fuse Block-Rear Body.
    • If the A23C Liftgate Latch Assembly activates 
  15. Replace the K9 Body Control Module.
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